Mascara brush



FIG. 1 is a front view of the mascara brush.

FIG. 2 is a right side view of the mascara brush.

FIG. 3 is a left side view of the mascara brush.

FIG. 4 is a top plan view of the mascara brush; and,

FIG. 5 is a bottom plan view of the brush. 

The ornamental design for a mascara brush, as shown and described. 